Garmin GPS Chartplotter?

[Steelshooter]

I've been looking at GPS Chartplotters to install on my Catalina 30. Currently there is no navigation gear installed and I've been looking at for something that will provide good service for the type of sailing that we do. Money is very much a factor and I believe that the Garmin 531 should fit the bill nicely. Our boat is a Great Lakes boat and there is no chance that she is going to be sailed to the deep blue. We are mostly day sailors and will be taking a week or two vacation a couple of times a year sailing around the Great Lakes.

So do you all think the Garmin 531 is a good choice?